The history of the mangrove vegetation in Bénin during the Holocene: A palynological study |
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| Institution: | 1. Royal Brompton & Harefield Hospitals, Imperial College, London, United Kingdom;2. National Heart and Lung Institute, Imperial College, London, United Kingdom;3. National Heart Center Singapore, Singapore;4. National Medical Research Council, Singapore;1. Department of Cardiology, University Hospitals of Strasbourg, Nouvel Hôpital Civil, Strasbourg, France;2. Biophysics and Nuclear Medicine, University Hospitals of Strasbourg, Nouvel Hôpital Civil, Strasbourg, France;1. Interventional Cardiology Unit, EMO-GVM Centro Cuore Columbus, Milan, Italy;2. Interventional Cardiology Unit, San Raffaele Scientific Institute, Milan, Italy;3. Imperial College, London, United Kingdom;4. Fukuyama Cardiovascular Hospital, Hiroshima, Japan;5. Department of Cardiovascular Medicine, Juntendo University, Tokyo, Japan;6. Interventional Cardiology Unit, New Tokyo Hospital, Chiba, Japan;1. Interventional Cardiology, “P.Giaccone” Universitary Hospital of Palermo, Italy;2. Interventional Cardiology, Fatebenefratelli Hospital of Milan, Italy |
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| Abstract: | Pollen analysis of three core samples,YEV-I, GOHO.00 and DO.00, taken in the coastal area of Bénin shows the existence of mangrove during the Holocene. This mangrove underwent many physiognomic changes from the middle to the late Holocene. In the course of the middle Holocene (from 7500 to 2500 years before present (BP)), it stretched over a large area from the littoral inland. It was tightly closed and almost monospecific, dominated by Rhizophora. During the late Holocene, this mangrove started to regress around 3000 years BP and disappeared about 2500 years BP from the studied sites. It has been replaced by swamp meadows dominated by Paspalum vaginatum Sw. and a fresh water environment colonised by taxa such as Persicaria, Typha, Ludwigia, and Nymphaea. |
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